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test: add unit tests to improve code coverage

Add comprehensive unit tests for low-coverage modules:
- Live_vue internals: object hashing, prop/stream diffing, and socket utilities
- SSR module: binary/map response handling, telemetry instrumentation
- SSR NodeJS integration: component rendering with props/slots via nodejs package

Includes mock ESM server for testing NodeJS SSR without external dependencies.

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Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>